Usage
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1. Download the MT.jar file above.
2. Extract the MT folder anywhere.
3. Move your world into the MT folder, and rename the world 'world'.
4. Double click start, and let it do the rest!

How It Works-------
The program works on a chunk deletion process, using a block whitelist to determine what goes, and what stays.
The program isn't always 100% perfect, and may delete chunks that have been used, but haven't had any whitelisted blocks placed down.

1. Always backup your map before any modification.
2. MCMap tool can render map into image.
3. WorldEdit plugin can recover old chunks from backup in game.
4. WorldEdit plugin can discard old chunks and regenerate new chunks in game.

Before & After-------

Before. 3GB in size.

After. 1GB in size.

Hope this helps! Although I'm not responsible for any world corruption/lost!